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  • Physiological and biochemical responses to elevated temperature in a threatened freshwater crayfish, Euastacus sulcatus (Decapoda: Parastacidae)

    Author(s)
    Bone, JWP
    Renshaw, GMC
    Wild, CH
    Griffith University Author(s)
    Renshaw, Gillian M.
    Wild, Clyde H.
    Bone, James W.
    Year published
    2017
    Metadata
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    Abstract
    Projected elevations in environmental temperature are expected to have a detrimental effect on organisms with distributions that are already restricted to high-altitude refugia, especially where dispersal is compromised due to population isolation by unsuitable intervening habitats. The present study was carried out on such an organism, namely Euastacus sulcatus, to determine: (1) the temperature at which thermal stress occurs under laboratory conditions; and (2) whether thermal stress is already occurring naturally in contemporary field-acclimatised individuals. The laboratory data provided evidence that biochemical and ...
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    Projected elevations in environmental temperature are expected to have a detrimental effect on organisms with distributions that are already restricted to high-altitude refugia, especially where dispersal is compromised due to population isolation by unsuitable intervening habitats. The present study was carried out on such an organism, namely Euastacus sulcatus, to determine: (1) the temperature at which thermal stress occurs under laboratory conditions; and (2) whether thermal stress is already occurring naturally in contemporary field-acclimatised individuals. The laboratory data provided evidence that biochemical and physiological stress occurred in E. sulcatus at 22.5°C or higher. In the field, oxidative stress was characterised by an increase in the oxidised redox state of glutathione within a low-altitude population accompanied by significantly elevated protein carbonyls and lipid peroxidation. The data confirmed that potential thermal stress was present in E. sulcatus residing at the lower end of its altitudinal distribution, indicating that this threatened species is already challenged within localised populations in their natural environment. Together, these results reveal that future increases in environmental temperature are not only likely to result in increased baseline levels of stress in E. sulcatus, but also forecast further restriction in the altitudinal distribution of the species in a warming climate.
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    Journal Title
    Marine and Freshwater Research
    Volume
    68
    Issue
    10
    DOI
    https://doi.org/10.1071/MF16232
    Subject
    Other environmental sciences not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/364658
    Collection
    • Journal articles

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